Question

1. a ball is rolling down the hill. once the ball reaches the bottom of the hill it keeps going until eventually it slows down and finally it stops. which force caused the ball to stop moving?

a. gravitational force
c. frictional force
b. magnetic force
d. invisible force

1. if you were able to visit jupiter what would be different about you in jupiter vs. earth?

a. your matter would be different.
b. your mass would be different.
c. your height would be different
d. your weight would be different

1. at what position does a tennis ball have maximum (pe) potential energy and zero kinetic energy?

a. when you place the ball on the ground
b. when you place the ball on the top of the refrigerator
c. when you throw the ball as high as you can.
d. when you roll the ball on the ground

1. keisha and jose calculate the total energy of a tennis ball rolling down an incline plane. their calculations showed that the total energy of the rolling tennis ball was less. explain why the total energy decreased.

a. the pe of the ball transformed into kinetic energy creating a decrease in the total amount of the energy.
b. the total energy decreased because the ball rolled slower when it reached the bottom of the incline plane.
c. the total energy decreased because part of the balls kinetic energy transformed into thermal energy due to the friction between the ball and the incline plane.
d. the total energy should have not decreased but increased.

Explanation:

Answer:

(1) c. Frictional force
(2) d. Your weight would be different
(3) c. When you throw the ball as high as you can
(4) c. The total energy decreased because part of the ball's kinetic energy transformed into thermal energy due to the friction between the ball and the incline plane